Add debugging tools

[nullishamy]

Brief summary
We need to add debugging tools to allow introspection into the state of the VM. These should be available from Java and within the VM itself.

Progress

• Inspect VM state
• Inspect heap state
• Inspect CPU usage
• Read logs
• Read JIT status

Status
Ongoing, but waiting for individual features to be complete before adding introspection to them. At the minute, we cannot do anything as we do not have custom class support (exposing internals to Java)